RHC Series
High Power Thick Film Chip Resistor
Rev Date: 06/19/2012 1 www.seielect.com
This specification may be changed at any time without prior notice marketing@seielect.com
Please confirm technical specifications before you order and/or use.
Stackpole Electronics, Inc.
Resistive Product Solutions
1% 5%
RHC2512 2512 2W 200V 400V ±100 ppm/ºC 0.1 - 1M 0.1 - 1M
(1) Lesser of
√
PR or maximum working voltage
Ohmic Range (Ω) and Tolerance
Maximum
Overload
Voltage
Resistance
Temperature
Coefficient
Type / Code Package
Type
Power Rating
(Watts) @ 70ºC
Maximum
Working
Voltage (1)
Test Typical
Moisture Resistance
±1%
Load Life
±1%
Resistance to Soldering
±1%
Temperature Cycling
±1%
Thermal Shock
±1%
Short Time Overload
±1%
Insulation Resistance
≥1MΩ
Operating Temperature Range: -55ºC to +155ºC
0.248 ± 0.008 0.126 ± 0.008 0.024 ± 0.004 0.028 ± 0.008 0.087 ± 0.008 inches
6.30 ± 0.20 3.20 ± 0.20 0.60 ± 0.10 0.70 ± 0.20 2.20 ± 0.20 mm
Type / Code Unit
RHC2512
LWH a b
Body Length Body Height Top Termination Bottom TerminationBody Width
LWD
Total Length Total Width Pad Depth
0.315 0.138 0.118 inches
8.00 3.50 3.00 mm
RHC2512
UnitType / Code
Features:
Electrical Specifications
Please refer to the High Power Resistor Application Note (page 4) for more information on designing and
implementing high power resistor types.
• Handles 2W of power
• Resistances from 0.1Ω to 1MΩ
• RoHS compliant / lead-free
• TCR of ± 100 ppm/ºC
• 1% and 5% tolerances
• Runs significantly cooler than standard thick film 2512 chip
Electrical Specifications
Mechanical Specifications
Solder Pad Dimensions
Performance Characteristics
RHC Series
High Power Thick Film Chip Resistor
Rev Date: 06/19/2012 2 www.seielect.com
This specification may be changed at any time without prior notice marketing@seielect.com
Please confirm technical specifications before you order and/or use.
Stackpole Electronics, Inc.
Resistive Product Solutions
0
Percent Rated Power (%)
100
-55ºC 70ºC
80
60
40
20
155ºC
-60 -40 -20 0 20 40 60 80 100
Ambient Temperature (ºC)
120 140 160 180
Power Derating Curve:
Temperature Rise:
Repeated Overload:
Test condition:
Voltage (Power): 2.0, 2.25, 2.5, 2.75, 3.0, 3,25 times of rated voltage. (8W, 10.1W, 12.5W, 15.1W, 18W, 21.1W)
Applied time:
Each voltage 5 seconds.
As a reference test, the RMC was tested with the same rated voltage and testing substrate.
140
120
100
80
60
40
20
0
Hot Spot
Solder Joint
1
2
1
2
Load (w) 1
0
2
Tem
p
erature Rise
Cº
RHC Series
High Power Thick Film Chip Resistor
Rev Date: 06/19/2012 3 www.seielect.com
This specification may be changed at any time without prior notice marketing@seielect.com
Please confirm technical specifications before you order and/or use.
Stackpole Electronics, Inc.
Resistive Product Solutions
12345678910111213
RHC2512FT10K0
Nominal
Resistance
10K
Type Description Code Wattage Size Tolerance
V
alues SEI Types Pkg Qty Description Code
RHC High Power 2512 2W 2512 1% E24, E96
5% E24
R
7" reel
plastic tape
2512 4,000 R
2512
Code
RHC 1%
SEI Type Tolerance Packaging
Size
RHC 2512 Code Tol Value Code Quantity
F1% E96, E24
J5% E24
High Power Size
T7" Reel
Plastic Tape 2512
Product Series Power Rating Packaging Resistance ValueTolerance
Four characters with the
multiplier used as the decimal
holder.
2W
1 Mohm = 1M00
0.1 ohm = R100
4.75 ohm = 4R75
10.2 Kohm = 10K2
Description
4,000
Legacy Part Number (before January 3, 2011):
How to Order
RHC Series
High Power Thick Film Chip Resistor
Rev Date: 06/19/2012 4 www.seielect.com
This specification may be changed at any time without prior notice marketing@seielect.com
Please confirm technical specifications before you order and/or use.
Stackpole Electronics, Inc.
Resistive Product Solutions
High Power Chip Resistors and Thermal Management
Stackpole has developed several surface mount resistor series in addition to our current sense resistors,
which have had higher power ratings than standard resistor chips. This has caused some uncertainty and
even confusion by users as to how to reliably use these resistors at the higher power ratings in their designs.
The data sheets for the RHC, RMCP, RNCP, CSR, CSRN, CSRF, CSS, and CSSH state that the rated
power assumes an ambient temperature of no more than 100 degrees C for the CSS / CSSH series and 70
degrees C for all other high power resistor series. In addition, IPC and UL best practices dictate that the
combined temperature on any resistor due to power dissipated and ambient air shall be no more than 105C.
At first glance this wouldn’t seem too difficult, however the graph below shows typical heat rise for the CSR
½ 100 milliohm at full rated power. The heat rise for the RMCP and RNCP would be similar. The RHC with
its unique materials, design, and processes would have less heat rise and therefore would be easier to
implement for any given customer.
The 102 degrees C heat rise shown here would indicate there will be additional thermal reduction techniques
needed to keep this part under 105C total hot spot temperature if this part is to be used at 0.75 watts of
power. However, this same part at the usual power rating for this size would have a heat rise of around 72
degrees C. This additional heat rise may be dealt with using wider conductor traces, larger solder pads and
land patterns under the solder mask, heavier copper in the conductors, vias through PCB, air movement, and
heat sinks, among many other techniques. Because of the variety of methods customers can use to lower
the effective heat rise of the circuit, resistor manufacturers simply specify power ratings with the limitations
on ambient air temperature and total hot spot temperatures and leave the details of how to best accomplish
this to the design engineers. Design guidelines for products in various market segments can vary widely so it
would be unnecessarily constraining for a resistor manufacturer to recommend the use of any of these
methods over another.
Note: The final resistance value can be affected by the board layout and assembly process, especially the size of the
mounting pads and the amount of solder used. This is especially notable for resistance values ≤ 50 mΩ.
This should be taken into account when designing.
